Injector



(ModeL) W. JOHNSTON,

INJECTOR,

,630. Patented Apr. 14,1885.

III VENTOI? UNITED Srrrrns Arnsi'r @rricn.

WILLIAM Jonnsron, or LA JUNTA, COLORADO.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 315,630, dated April14, 1885.

Application filed October 15, 18 84. (Model) foo/ZZZ whom it mrtcmtce-rn:

Be it known that I, WILLIAM JoHNsro v, of La Junta, in the county ofBent apttfitate of Colorado, have invented certain new and usefulImprovements in Injectors and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to an improvement in injectors. Injectors used onlocomotives, or wherever they are subjected to a constant jar, becomeafter a short time more or less worn at the point where the sectionscome in contact. This wear will render the injector less and lesseffective, until it is necessarily cast aside as useless and a new onesubstituted. It is found, also, that by increasing the annular spacebetween the intermediate and com-' bining tube the work of the injectoris materially increased.

My present invention has particular-reference to that form of injectorin which an intermediate tube is interposed between the receiving andcombining tubes, of which the Friedmann injector is a type, although myinvention, in one respect at least, applies equally to all forms ofinjectors in which two separate sections rest in contact with eachother.

The object of my invention is to provide re movable bearings adapted totake the wear between two sections, a further object being to provideremovable bearings which shall at the same time form spacing-lugs,whereby the work of the injector is materially increased.

With these ends in View my invention con sists in certain features .ofconstruction and combinations of parts, as will be hereinafterdescribed, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal section of myimproved injector, and Fig. 2 a view of the intermediate section inperspective.

A represents a steam-supply pipe leading from the boiler to thereceiving-tube a.

B represents a water-supply pipe leading from a tank of water to thechamber 2) about the nozzle of the receiving-tube a. The chamher I) isinclosed by a cylinder or barrel, 0, in one end of which thereceiving-tube a is snugly fitted. An intermediate tube, D, is providedwith a bell or funnel shaped month, 1?, he rim of which fits the bore ofthe barrel 0. The small end of tube a projects centrally into thefunnel-mouth of the tube D, and is held in the p roper position thereinby means of radial lipsiE, formed on the tube a, the said lugs restingin contact with the edge of the rim of the mouth (Z, and the'ends of thelugs bearing against the inner surface of the barrel. The nozzle of theintermediate tube, D, is provided with a series of ribs, 6, preferablyfour in number, which extend longitudinally from an annular shoulder, F,adjacent to the rim at the funnel-mouth end of the tube to a point ashort distance back from the end of the nozzle. As hithertoconstructed,the ends of the ribs 6 form rests upon which the edge of thefunnel-shaped mouth g of the combining-tube G were adapted to rest.

My improvement consists in providing the ends of the ribs 6 withremovable bearings H. These bearings H may be made of soft or hardmetal, or of any material which it is found advantageous to use. Theymay be simply set in sockets in the ends of the ribs, or may be screwedinto threaded perforations made in the ends. They are preferably roundand provided with flat heads, which receive the edge of the mouth 9thereon. The combining-tube G is also pro vided with longitudinal ribsh, corresponding with the ribs on the intermediate section justdescribed, but having recesses I, centrally located and semicircular inshape. The combining-tube G is further provided with an annular flange,i, which is connected with a similar flange, K, on the delivery-tube Lby the straps k. The tube G is also provided with a hole, m, a shortdistance back from the end of the nozzle. The intervening spaces betweenthe tube D and the barrel 0 are connected by the annular space about thefunnel end of the tube G, and this same space is also connected with theoverflow-pipe l.

The several supply and delivery pipes being provided with suitablevalves, the opera tion of my improved injector is the same in general asthose heretofore constructed. I find, however, that the increase of thespace between the intermediate and the combining tubes in the manner inwhich I have accomplished it will render the injector much moreeffective than those hitherto constructed, my

tests having shown that the amount of water supplied to the boiler witha given pressure of steam is, as nearly as Ican estimate it with thefacilities I have at hand, fully one-tenth greater than the amountsupplied by the former construction; and, further, that the injectorwill operate under a much lower pressure of steam than hithertorequiredto render it operative. I have not at present satisfied myselfas to the theory for this increase. It may be due to the forcing of theoverflowwater which backs into the chamber about the intermediate tube,and is drawn from thence into the main jet; or it may be due to therelative position of the end of the nozzle of the intermediate tube tothe combining-tube; or it may be due to some entirely different cause.

The constant jar to which the injector is subjectedon therailway-locomotive, forIeXam-I;

ple-will cause wear on the bearings'between the sections D and G, andwhen this wear amounts to enoughto render the injector partially orquite inoperative the bearings H can be readily removed,:new bearingssubstituted in their place, and .the injector thus made as good as newat a very slight expense. This 1. In an injector, the, combination, witha combining-tube andintermediate tube, of removable bearings adapted toform a rest for the end of the combining-tube, substantially as setforth.

2. In an injector, the combination, with a combining-tube and anintermediate tube, of a set of removable bearings secured to shoulders0n the intermediate tube, adapted to receive and take the wear of thecombining-tube, substantially as set forth.

3. In an injector, a set of removable spacing-lugs interposed betweenthe intermediate and combining tubes, whereby the work done by theinjector is increased, substantially as set forth. r I

,{th ln aninjector, a setof "removable spacfjingglfngsinterposed betweenthe combining and-"intermediate tubes, said spacing lugs formingbearings betweensaid tubes, substantially as set forth.

.In testimony whereof I have signed this specification in the presenceof .two subscrib ing witnesses.

S. G. NOTTINGHAM, E.-O. SEWARD.

